update 添加常见负载均衡相关代码

Author: caojx-git

code/loadbalance-java/.idea/.gitignore

@@ -0,0 +1,11 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<module type="JAVA_MODULE" version="4">
+ <component name="NewModuleRootManager" inherit-compiler-output="true">
+ <exclude-output />
+ <content url="file://$MODULE_DIR$">
+ <sourceFolder url="file://$MODULE_DIR$/src" isTestSource="false" />
+ </content>
+ <orderEntry type="inheritedJdk" />
+ <orderEntry type="sourceFolder" forTests="false" />
+ </component>
+</module>

code/loadbalance-java/.idea/compiler.xml

@@ -0,0 +1,23 @@
+package com.caojx.learn;
+
+import java.util.Random;
+
+/**
+ * 随机轮询
+ *
+ * @author caojx created on 2022/6/20 8:34 PM
+ */
+public class RandomSelect {
+ /**
+ * 随机访问集合中的某一个值即可
+ *
+ * @return
+ */
+ public static String getServer() {
+ Random random = new Random();
+ int rand = random.nextInt(ServerIps.LIST.size());
+
+ // 随机访问集合中的某一个值即可
+ return ServerIps.LIST.get(rand);
+ }
+}

code/loadbalance-java/.idea/misc.xml

@@ -0,0 +1,33 @@
+package com.caojx.learn;
+
+/**
+ * 轮询
+ *
+ * @author caojx created on 2022/6/20 8:38 PM
+ */
+public class RoundRobin {
+
+ // 位置
+ public static Integer POS = 0;
+
+ /**
+ * 轮询按序遍历即可
+ *
+ * @return
+ */
+ public static String getServer() {
+ String ip = null;
+
+ synchronized (POS) {
+ if (POS >= ServerIps.LIST.size()) {
+ POS = 0;
+ }
+
+ ip = ServerIps.LIST.get(POS);
+ POS++;
+ }
+
+ return ip;
+ }
+
+}

code/loadbalance-java/.idea/modules.xml

@@ -0,0 +1,30 @@
+package com.caojx.learn;
+
+import java.util.Arrays;
+import java.util.LinkedHashMap;
+import java.util.List;
+import java.util.Map;
+
+/**
+ * 服务器id
+ *
+ * @author caojx created on 2022/6/20 8:34 PM
+ */
+public class ServerIps {
+
+ /**
+ * A、B、C 假设是三台服务器
+ */
+ public static final List<String> LIST = Arrays.asList("A", "B", "C");
+
+ /**
+ * A、B、C 服务器，带权重
+ * 即假如10次请求，A要请求2次，B要请求3次，C要请求5次
+ */
+ public static final Map<String, Integer> WEIGHT_LIST = new LinkedHashMap<>();
+ static {
+ WEIGHT_LIST.put("A", 2);
+ WEIGHT_LIST.put("B", 3);
+ WEIGHT_LIST.put("C", 5);
+ }
+}

code/loadbalance-java/.idea/uiDesigner.xml

@@ -0,0 +1,37 @@
+package com.caojx.learn;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Random;
+
+/**
+ * 加权随机
+ *
+ * @author caojx created on 2022/6/20 8:49 PM
+ */
+public class WeightRandom {
+
+ /**
+ * 缺点权重大ips越大占内存带权重随机
+ *
+ * @return
+ */
+ public static String getServer() {
+
+ List<String> ips = new ArrayList<>();
+
+ for (String ip : ServerIps.WEIGHT_LIST.keySet()) {
+ Integer weight = ServerIps.WEIGHT_LIST.get(ip);
+
+ // weight多少在ips里面存多少 例A权重为2 在ips里面存两个
+ for (int i = 0; i < weight; i++) {
+ ips.add(ip);
+ }
+ }
+
+ // 随机取，这里说的是概率
+ Random random = new Random();
+ int randomPos = random.nextInt(ips.size());
+ return ips.get(randomPos);
+ }
+}